Sofa



FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is a left end elevational view thereof, the right end being a mirror-image thereof.

The bottom is plain and unornamented. 

The ornamental design for a sofa, as shown and described. 